The a little voice in your head that warns you not to do something you were just about to do is real, brain researchers say.

Well, maybe not the voice. But researchers now say last-minute second thoughts come from a specific part of the brain.

A different area of the brain allows us to act voluntarily. That's free will. This is "free won't," suggest Marcel Brass, PhD of Germany's Max Planck Institute and Patrick Haggard, PhD, of England's University College London.

Curious as to how they came to this conclusion? Check it out here.artwork credit: www.summersdale.com